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To reduce the lead time of a routing or production order you can overlap operations. This means that an operation starts before the previous operation has finished (see Overlapping graphic, for instance, operations 40 and 50 ).

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You can define for each individual operation whether it should overlap with the next consecutive operation and in what way. To do this you can set the following indicators:

  • Required overlapping

This means the operations always overlap

  • Optional overlapping

This means the operations overlap if scheduling uses a reduction level that allows overlapping

  • Flow manufacturing

This means the system extends the lead time of all operations, that overlap using flow manufacturing, to the same length as the lead time of the longest of these operations. As with required overlapping , the operations always overlap.

For every type of overlapping you can

  • Define a minimum overlap time which only allows overlapping after a particular minimum limit has been reached.

  • Define a minimum send-ahead quantity to ensure that the operation is performed for a particular minimum quantity of the material to be produced, before the next operation starts.


You enter the overlap indicator, minimum overlap time and minimum send-ahead quantity on the operation details screen.